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Growth Attributes and Distributional Pattern of Halophytic Cyperus Laevigatus L

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Growth Attributes and Distributional Pattern of Halophytic Cyperus Laevigatus L Pak. J. Bot., 49(5): 1697-1707, 2017. GROWTH ATTRIBUTES AND DISTRIBUTIONAL PATTERN OF HALOPHYTIC CYPERUS LAEVIGATUS L. ALONG SALINITY AND ALTITUDE GRADIENTS MEHWISH NASEER1, MANSOOR HAMEED1, FAROOQ AHMAD1 AND SHAHZAD MAQSOOD AHMAD BASRA2 1Department of Botany, University of Agriculture, Faisalabad 38040, Pakistan 2Department of Agronomy, University of Agriculture, Faisalabad 38040, Pakistan Corresponding author’s email: [email protected] Abstract To examine the growth response and distributional pattern of a potential hydro-halophyte, Cyperus laevigatus L., a detailed survey of Punjab province was conducted. Sixteen habitats possessing different salinity and altitude levels were explored and different soil and eco-morphological parameters were assessed. C. laevigatus growing at Pakka Anna with heavily sat-affected sandy loam soil and low altitude showed the maximum growth, however, many other habitats with higher salinity and low altitude showed reduced growth like Sangla Hill and Sargodha as compared to Pakka Anna. Therefore, it was concluded that distribution and growth of C. laevigatus was not due to either salinity or altitude, but depends on the combined effect of many environmental factors like soil texture, ECe, altitude etc. however, the degree of tolerance of this species was extremely high not only along salinity but also with altitude. Key words: Altitude; Cyperus laevigatus; Salinity, Growth, Ecology. Introduction influence of salinity (Tuna et al., 2007; Lin & Bañuelos, 2015). In Pakistan, salt-affected habitats like salt marshes Wetlands are the water bodies which are formed due the and dryland salinities are characterized by salt indicator accumulation of stagnant or flowing, fresh as well as salt species including Cyperus lavigatus (Khan & Qaiser, water. Wetlands are rare and unique ecosystems that are 2006). All over the world, the most common salinity important part of global ecosystem (Koull & Chehma, 2016). indicator species are Sonneratia apetala, Allenrolfea These ecosystems provide a wide range of services related to occidentalis, Sporobolus virginicus, Atriplex spp., biodiversity, water regulation and tourism by supporting Aegiceras corniculatum, Avicennia marina, Bruguiera many endemic plants and animal species (Gill et al., 2012). gymnorrhiza, Mesembryanthemum crystallinum, Crambe Wetlands create considerable impact on different economic maritima, , Sesuvium portulacastrum, Casuarina spp., and social aspects of any country such as tourism, industry Chenopodium album, Distichlis spicata, Hordeum and agriculture. Wetlands not only support rare plant species marinum, Glycyrrhiza glabra, Juncus acutus, Rhizophora but are also main breeding centers for waterfowls (Khan & mucronata, Salsola vermiculata, Portulaca oleracea, Arshad, 2014). Natural wetlands are declining throughout the Salicornia europaea, Plantago media, Suaeda maritime, world due to anthropogenic activities like population Suaeda australis, Tetragonia tetragonioides and pressure, construction work, industrial effluents and use of Sarcocornia quinqueflora (Aslam et al., 2011). pesticides etc. in agriculture (Prasad, 2010). Cyperus laevigatus L., commonly called smooth flat The vegetation zones in salt marsh are very specific sedge, is perennial sedge that is distributed in subtropical and dominated by unique plants. Examples are the areas of the world with hot and arid climatic conditions. It complete dominance of Spartina alterniflora and grows mostly in aquatic habitats, particularly mud flats, Salicornia virginica in low elevation marshy habitats of flood plains and sandy coastal places, where brackish water New England (Bertness, 1991). Similarly, terrestrial and and waterlogged soils are dominant (Piwpuan et al., 2013). seaward borders are occupied by Juncus gerardi and C. laevigatus is used for making mats and for the treatment + Spartina patens (Pennings & Callaway, 1992). Disturbed of wetland systems, in which NH4 concentrations are high marshy habitat in California are occupied by Distichlis (Jampeetong et al., 2012). It was hypothesized that spicata and Salicornia europaea (Bertness, 1991). The differential salinity and altitudinal gradients may distribution of these plants depends upon the plant significantly influence growth and distributional pattern of tolerance to the harsh environment of the zone and other this species in the Punjab region. C. laevigatus is an physical characteristics associated with tidal inundation important component of salt marshes supporting a number (Bertness & Ellison, 1987). Most plants that grow in of wildlife species, and this study will help to investigate wetlands and salt marshes possess adventitious root degree of tolerance in C. laevigatus, which is important to system at the sediment surface to facilitate the exchange re-vegetate disturbed habitats throughout the province due of gases like Spartina alterniflora roots penetrate in the to anthropogenic activities. uppermost 3 cm zone of the sediment (Anderson & Treshow, 1980). Some plants possess well-developed Materials and Methods aerenchyma formation in roots for transfer of oxygen from atmosphere to submerged roots (Armstrong, 1979; Cyperus laevigatus populations were explored in the Silliman, 2014.). Punjab province to investigate growth response and Salinity is an important soil feature due to which crop distributional pattern along salinity gradient. The production and environmental quality have been severely populations were collected from Rasul Headworks, affected (Ashraf & McNeilly, 2004). A salinity indicator is Bhurban, Treemu Headworks, Dape Sharif, Domeli, a sign or symptom that recommends the soil is under the Ucchkera, Baloki, Motorway 3, Kirana Hills, Khanki, 1698 MEHWISH NASEER & MANSOOR HAMEED Sargodha, Jahlar Lake, Sangla Hill, Pakka Anna, Kalar Salt Range (and other mountainous habitats) in Pakistan Kahar Lake and Sahianwala (details are presented in mainly composed of sandstone or limestone (Abu Bakar Tables 1 & 2, Figs. 1-3). et al., 2013), and this might be a reason of dominance of Soil that adhere the roots was taken from each basic soils throughout. habitat at 10 cm depth (root-zone) to analyze the Saturation percentage ranged from 24.1-41.1, the physicochemical characteristics. For saturation higher values of saturation percentage was recorded in percentage, pH and electrical conductivity of soil, 200g soils from saline waterlogged areas like Sahianwala and of dried soil was taken for the preparation of saturation Sargodha, but Treemu and Motorway 3 showed the lower paste. Saturation percentage was determined by values (Table 1). Soil saturation percentage can be related subtracting the weight of saturated paste from dry to textural class (Aali et al., 2009), and salinity gradient weight of soil. The soil extract was used to determine may not influence this characteristic. the pH and ECe using pH/ECe meter (WTW series A huge variation was observed in electrical InoLab pH/Cond 720). The soil extract was used to conductivity (ECe) of habitats, it varied from 1.2-47.8. determine the pH and ECe using pH/EC meter (WTW The minimum ECe was recorded at Rasul, while the series InoLab pH/Cond 720). The protocol followed by maximum was at Sahianwala. Habitats like saline Moodie et al. (1959) was used to determine soil waterlogged areas, salt marshes and saline fish ponds texture. Sodium (Na+) content was determined with a showed exceptionally high ECe (Table 1). Source of flame photometer (Jenway, PFP-7), whereas Cl- salinity in salt marshes of the Salt Range is due to runoff content was determined with a digital chloride ion water that contains salts from exposed rocks and also by meter (Jenway, PCLM 3). brine springs, resulting in an accumulation of large The plants were carefully uprooted from their natural quantities of salts (Hameed et al., 2008). Lands at habitats without damaging their root for measuring Sahianwala and Pakka Anna are heavily salt-infested morphological characteristics like plant height, and fresh resulting in large non-cultivable areas (Batool & and dry weights of plants. For ecological studies, density Hameed, 2013). per unit area (1x1 m2) was calculated from 6 different sites within each habitat using quadrat method. Percent Ecological characteristics: The minimum density and cover within 1x1 m2 quadrat was estimated by visual percent cover was recorded from Rasul where vegetation observation. Associated species within C. laevigatus was very sparse and scattered (Table 3). The population population were also observed. was collected from the river bank, and this habitat might The Principal Correspondence Analysis (PCA) not be suitable for growth and propagation of C. technique was applied on different morpho-ecological laevigatus, which is a halophytic sedge (Khan & Qaiser, parameters to determine the degree of association 2006). In spite of a halophyte, it showed some growth between habitats and soil parameters and plant eco- over there, indicating its wide range of degree of morphological characteristics using XLSTAT software. tolerance to a variety of habitats. The maximum density Correlation among different parameters was assessed was observed at Sahianwala which was followed by using Microsoft Excel. Pakka Anna, however, maximum cover was noted at Pakka Anna followed by Sahianwala (Table 3). These Results habitats were heavily salt-affected where salinities ranged between 30-50 dS m-1. The high salinities Soil characteristics: A wide range of variation was seemed to be quite suitable for
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